Helmet

A helmet or helm is a form of protective gear worn to protect the head. More specifically, a helmet complements the skull in protecting the human brain. Ceremonial or symbolic helmets (e.g., a policeman's helmet in the United Kingdom) without protective function are sometimes worn. Soldiers wear combat helmets, often made from Kevlar or other lightweight synthetic fibres.

Quotes

 * Man, when I’m riding with the helmet on, I’m invisible. And people just deal with me as the guy on the bike. ... it gives you a chance to read ’em.
 * Brad Pitt, interviewed by Elvis Mitchell, "Brad Pitt", Interview (7 February 2012), Online